div移动层精简示例（event事件兼容多浏览器）

<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
< html  xmlns ="http://www.w3.org/1999/xhtml" >
< head >
< title >  New Document  </ title >
< meta  http-equiv ="Content-Type"  content ="text/html; charset=utf-8"   />
< meta  http-equiv ="Content-Language"  content ="zh-CN"   />
< script  language ="JavaScript"  type ="text/javascript" >
var  drag_ = false
var  D = new  Function( ' obj ' , ' return document.getElementById(obj); ' )
var  oevent = new  Function( ' e ' , ' if (!e) e = window.event;return e ' )
function  Move_obj(obj){
     var  x,y;
    D(obj).onmousedown = function (e){
        drag_ = true ;
         with ( this ){
            style.position = " absolute " ; var  temp1 = offsetLeft; var  temp2 = offsetTop;
            x = oevent(e).clientX;y = oevent(e).clientY;
            document.onmousemove = function (e){
                 if ( ! drag_) return   false ;
                 with ( this ){
                    style.left = temp1 + oevent(e).clientX - x + " px " ;
                    style.top = temp2 + oevent(e).clientY - y + " px " ;
                }
            }
        }
        document.onmouseup = new  Function( " drag_=false " );
    }
}
</ script >
< body >
< div  id ="test"  style ="background-color:#0099CC;width:200px;height:100px;border:1px #000 solid;"  onmouseover ='Move_obj("test")' > 鼠标过来点击拖动层 </ div >
</ body >
</ html >